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A 95% confidence interval (using the conservative value for the degrees of freedom) for μ1 - μ2, based on two independent samples of sizes 18 and 20, respectively, gives us (45.6, 56.7).
What would be the margin of error for a 99% confidence interval for μ1 - μ2?
BLOOD TESTS If a certain disease is present, then a blood test will reveal it 95% of the time. But the test will also indicate the presence of the disease 2%.
Describe the differences between the distributions of majors for women and men with percentages, with a graph, and in words.
Use these data to test the hypothesis that the taking of aspirin does not change the probability of having a heart attack.
Construct a 90% confidence interval for the proportion of adults who are worried about having enough money for retirement.
Find the angle that the string makes with the upward vertical when the ball begins to leave its circular path. Show that, in the subsequent projectile motion, the ball returns to its starting point.
Set up the null and alternative hypothesis to test the researcher's prediction.
a system consists of 4 identical components where at least 3 components need to work for the system to work. each
Think about what these symbols can mean to you, and how your perceived meaning can differ from others' perceptions. Share your answers here.
Linguistics of 100 students, 24 can speak French, 18 can speak German, and 8 can speak both French and German. If a student is picked at random.
Compute P(X) using the binomial probability formula. Then determine whether the normal distribution can be used to estimate this probability. If so, approximate P(X) using the normal distribution and compare the result with the exact probability. ..
As markets become more and more international, many firms invest in research aimed at determining the maximum possible extent of sales in foreign markets.
For a medical study, a researcher wishes to select people in the middle 90% of the population based on blood pressure. If the mean systolic blood pressure is 120 and the standard deviation is 8, find the upper and lower readings that would qualify..
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